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UV protective cosmetic composition

a cosmetic composition and ultraviolet light technology, applied in the field of ultraviolet light protective cosmetic compositions, can solve the problems of undesirable unnatural whiteness when applied to the skin, the fine particle zinc oxide described in the above-mentioned publications, and the insufficient ultraviolet light protection effect of the ultraviolet light region, and achieve the effects of high spf, superior uv protection ability, and high uv protection

Inactive Publication Date: 2014-06-12
SHISEIDO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The inventors found a solution to the problem of UV protective cosmetics not providing enough protection in the wavelengths that matter (370-400 nm). They added larger particles of zinc oxide to the cosmetic, which led to better protection without needing a white pigment. This results in a higher critical wavelength, which is important for UV protection.

Problems solved by technology

However, fine particle zinc oxides as described in the above-mentioned publications have an insufficient UV protective effect in the UVA region (in particular, in 370-400 nm wavelength region).
Therefore, in order to achieve the critical wavelength of 370 nm in a high SPF formulation, the formulation needs to be added a large amount of a white pigment such as titanium dioxide, thereby resulting in an undesirable unnatural whiteness when applied to the skin.
Furthermore, since it contains at most 0.5% by mass of a white pigment such as titanium dioxide, an undesirable white appearance upon application to the skin does not occur.

Method used

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Examples

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examples

[0042]The present invention will be described in more detail below with reference to specific examples, which is not intended to limit the technical scope of the present invention in any way. It is noted that the content in the following Examples, Comparative examples and Formulation examples are all expressed in % by mass.

[0043]The UV protective cosmetic compositions (in the form of an oil-in-water emulsion) were prepared according to the formulations shown in Table 1 and 2 below. For each cosmetic composition, an SPF and critical wavelength were measured following the above-mentioned method. Furthermore, for the degree of whiteness of the skin when each cosmetic composition is applied to the skin, 10 trained panels tested the cosmetic compositions by an actual use test. The results of the evaluation were also shown in Table 1 and 2. The degree of whiteness of the skin was rated on three scales as follows:

Evaluation scales:

The cosmetic composition hardly appears white on the skin (...

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Abstract

The present invention aims to provide a UV protective cosmetic composition having a high SPF and having a protective effect in a broad wavelength region over UVA and UVB, without undesirable white appearance upon application to the skin. The UV protective cosmetic composition of the present invention comprises (a) 3-15% by mass of one or more UV absorbing agents; (b) 10-22% by mass of zinc oxide with an average particle diameter of 35-80 nm; and optionally (c) 0-0.5% by mass of a white pigment, wherein the SPF of the cosmetic is 30 or greater, and the critical wavelength of the cosmetic is 370 nm or greater.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority to JP App. Ser. No. 2012-182066 filed Aug. 21, 2012, the entire contents of which are incorporated herein fully by reference.FIGURE SELECTED FOR PUBLICATION[0002]NoneBACKGROUND OF THE INVENTION[0003]1. Field of the Invention[0004]The present invention relates to a UV protective cosmetic composition which can protect ultraviolet rays in UVA and UVB regions in a proper balance while having a high SPF. In particular, the present invention relates to a UV protective cosmetic composition containing UV absorbing agents, zinc oxide, and optionally a white pigment in an amount equal to or less than a predetermined level.[0005]2. Description of the Related Art[0006]It is one of the important issues for skin care and body care to protect the skin from ultraviolet rays. It has been known that not only medium wavelength ultraviolet rays (UVB: wavelength of 290-320 nm) cause tanning, inflammation and the like, but also...

Claims

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Application Information

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IPC IPC(8): A61K8/36A61K8/368A61K8/29A61K8/27A61Q17/04
CPCA61K8/36A61K8/27A61Q17/04A61K8/368A61K8/29
Inventor IKEBE, YOSUKEHIRUMA, TAKUYAHARADA, TAICHIFUKUHARA, KAZUTO
Owner SHISEIDO CO LTD
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